The mother of a schoolgirl who was brutally bashed at a train believes the attack was premeditated after footage of the brawl was sent to her daughter.

Destiny, 13, was walking to western Sydney's Blacktown train station with her friend Catherine, 15, on March 1 when she was set upon by a group of more than six older girls who began punching and kicking her.

Footage of the attack began circulating on social media days afterwards, leading Destiny's mother Shelley to believe it was premeditated, reports9 News.

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Footage of the attack shows Destiny (left) cowering on the ground as her attackers continue to punch and kick her and friend Catherine (right)

Destiny's mother has launched an online petition to tackle violence and bolster security at train stations in the wake of the attack

Footage shows Destiny cowering on the ground as her attackers continue to punch and kick her, at which point her friend Catherine steps in to protect her friend, sustaining injuries to her eye.

'I was just like very scared because they were older girls, they were bigger than me,' Destiny said.

Destiny, whose surname is not known, said she was sent footage of the attack the following day, forcing her to endure the brawl a second time.